Speedoscope.



L. C. DUNCAN.

SPEEDOSGOPE.

I APPLICATION FILED MAR. 31,1913.

1,105,41 1 Patented July 28,1914.

. 4 SHEETS-SHEET 1.

nvcul'o:

Lefifer C Punch/1 km 3 k. :5 Ma- (3 fy Rm L. U DUNCAN.

SPEEDOSGOPB.

APPLICATION FILED MAKEL 1913v 1 1G5 5 a latented July 28, 191%.

4 SHEETS-SHEET 2.

an m nl'oz Leaf C Duncan L DUNCAN.

SPEEDOSGQPE.

APPLICATION ILLED'MAR. s1, 1913v 1,1 @5f11 l Patented July 28,1914.

4 SHBETS SHEET 3.

& 1. 652* (J. Human Chlozncu L. U. DUNCAN.

SPEEDOSGOPB.

APPLICATION IlLED MAR.31,1913. TL5A1 1. Patented; July 28, 191 1.

6% SHEETS-SHEET i4 Lesfer C Duncan LESTER 0. Duncan, or LENIA, IDAHO.

SPEEDOSCOPE.

Specification of Letters Patent.

Patented July as, 1914..

Application filed March 31, 1913. Serial No. 757,751.

To all whom it may 0012061 11 Be it known that I, LESTER C. DUNCAN, a citizen of the United States,'residin at Lenia, in the county of Bonner and gtate of Idaho, have invented new and useful Improvements in Speedoscopes, of which the following is a specification.

My invention relates to an improved form of speedoscope and. has as its principal object the revision of means for indicating the speed at which a vehicle was traveling just before it was stopped.

"A second object of my invention is to provide means whereby an alarm is rung when the vehicle reaches a predetermined speed.

'The fin'al :object of my invention resides in the particular arrangement'and combination of parts hereinafter described.

In the accompanying drawings :-Figure 1 is a side elevation of my improved device. 2 is a. front elevation of the device shown in Fig. 1. Fi 3 is an elevational 'view of the interior 0 my device the front covers being removed and certain parts of the mechanism being removed for purposes of clear illustration, the parts being shown in the position when at'rest. Fig. 4 is a view similar to Fig. 3 but showing the parts in a position as when the device is being operated. Fig. 5 is an elevationalview taken from the same position as Fig. 1, but parts being broken away and parts being shown in section for purposes of illustrating the interior mechanism. Fig. 6 is a front view of my device, the (glass cover and hands having been remove Fig. 7 is a detail perspective view showing certain of the gear trains used to operate the device, Fig. 8 is e a detail perspective view of the dog used in the recording apparatus. Figs. 9 and 10 are detail views of the indicating and recording hands, respectively.

In the separate views, the same part is indicated by the same reference character.

Referring more particularly to the drawing, 1 is an outer case, preferably cylindrical in form, provided with a rear cover not shown, and a front opaque cover 2 shown in Fig. 5. In frontof the opaque cover 2 is a glass cover 3. i

The spindle 10 is mounted within the case 1 as shown in Fig. 5, there being ball bearings provided at each end of the spindle. It

is intended that the spindle 10 shall be connected by suitable mechanism with the axle of the vehicle whose. speed it is desired to read and record. Slidably mounted on the spindle 10 is a sleeve llprovided with an outerserrated surface. A spring 15 is providedwhich is coiled about the spindle 10 and which acts normally to move the sleeve 11 upward into the position shown .in Fig. 3. I provide means, however, adapted when the spindle 10 is rotated, to overcome the force of the spring 15. and these means are preferabl two rings such as 13 pivoted to the spind e 10 by means of apin shown at 14 in Fig. 4, said pin extending at right angles to. the spindle 10. The rings 13 are connected to the sleeve 11 by'means such as links 12-12, said links having pivotal connection with both the rings and the sleeve. As shown in Fig. 3, the normal position of the sleeve is such that the rings 13 are drawn into a position oblique to the spindlelO, but as the spindle is revolved centrifugal force tends to throw the rings 13 into a plane at right angles to the spindle, it being understood that one of the rings 13 is larger than the other so that the two may revolve about the same pivot without interference. As the rings move from the position shown in Fig. 3 to that shown in Fig. 1 the sleeve 11 is drawn downward against the action'of thespring 15. I provide a pinion 16 which meshes with the serrations on the outer surface of the-sleeve 11. Pinion 16 is clearly shown in Fig. 7 but in Fig. 5 it is covered by the sleeve 11. Pinion 16 is carried on the shaft 18 and said shaft also carries a gear 19 which meshes with gear 20 on the shaft 21. The shaft 21 projects through the front cover 2 and carries at its outer end a pointer 17 which cooperates with the scale 17 shown in Fig. 2, in order to indicate the speed at which thevehicle is moving. As clearly shown in Fig. 9 the pointer 17 is keyed rigidly to the shaft 21 by the key By the mechanism just described it will be seen that the movement of the rings 13 is transmitted to the pointer 17,. and that said mechanism and counter, together with the scale, constitute the indicating portion of my device.

In order to show the speed at which the vehicle was traveling shortly before it stopped, or in other words provide a registering means in connection .with my speedoscope, I provide on the u per end of the spindle 10 a worm 28 whic meshes with a gear 29 shown in Fig. 7 but obscured in Fig. 5. Gear 29 is carried on a shaft 30 and said from the zero position,

shaft also carries a worm 32 which meshes with a gear 31 on a shaft 33. Shaft 33 carries a worm 34 which meshes with a gear 35. Gear 35 is mounted on a shaft 36 which is parallel to but separate from the previously mentioned shaft 18. The line of division between the shafts 18 and 36 is indicated in the broken away portion of Fig. 5. The shaft 36 also carries a gear 37 which meshes with a gear 38. The gear 38 is fastened to the side of a disk 39 and both 38 and 39 are loose upon the shaft 21. On the opposite side of the disk 39 from the gear 38 said disk is provided with a series of notches such as 26. Moreover a sleeve 24 is loosely mounted on the shaft 21 and provided with an arm extending parallel to the face of the disk 39, said arm being provided with a dog 25 which is adapted to engage the teeth 26 so as to drive the sleeve 24 in one direction, a spring 27 being provided which bears against the inner face of the head 2 and against the sleeve 24 so that dog 25 is always held against the teeth 26. However, the spring 27 is a light one so that dog may be caused to slide over the teeth 26 without the expenditure of much force. The sleeve 24 projects through the head 2 and has rigidly mounted thereon the pointer 23. The pointer 23. is provided with a pin 22 which projects up into the path of the pointer 17 so that as the pointer 17 moves t e pointer 23 is pushed in front of it. Now it must be un- (erstood that the gear operated from the worm 28 through the shafts 30, 33 and 36 is designed to turn the disk 39 and consequently the sleeve 24 and the pointer 23 in a direction opposite from that which it is turned by the pointer 17. Consequently if, after having moved the pointer 23 the pointer 17 withdraws from its outermost. position, the gearing just described will 1mmediately tend to turn the pointer 23 back toward zero position. Consequently the pointer tends always to follow the pointer 17, but if the vehicle is stopped, the pointer 17 will immediately dro back to Zero whereas the gear operating t e pointer 23 having been stopped, the latter pointer will remain so as to register the speed at which the machine Was traveling immediately before it was stopped.

In order to warn the driver of a vehicle when he is exceeding the speed limit, I provide an adjustable alarm. Said alarm comprises two standards such as 60 which project from the rear cover of the case 1. Car ricd by the standard 60 is a vertical rod or shaft 41 which is provided with a rack 40. The rod 41 carries a finger 42 which is mounted directly on a pivot pin 46 carried in an insulating bushing 43. A spring 47 normally swings the arm or finger 42 into the position shown in Fig. 3, its further movement being prevented in one direction by the pin 47, but it will be seen that the arm is free to move downward when the tension of spring 47 is overcome by contact between the end of the arm and the collar 51 on the sleeve 11.

Now the arm 42 is con nected directly to a wire 45 which forms part of a circuit including any suitable source of current and the electric bell 44, it

being understood that the end of the circuit 1 remote from the arm 42 is grounded to the case 1. Consequently, when the sleeve 11 is moved by the action of the rings 13 so that the collar 51 contacts with the arm 42, the bell is rung so as to warn the driver. The arm 42 may be set so that the alarm will be sounded at any desired speed and for this purpose I provide a gear 48 which meshes with the rack 40 and is carried by a shaft 61 extending through the side of the case 1. At the outer end, the shaft 61 carries a knurled nut 49 by which it may be turned and a hand or pointer 50 is also carried on said shaft onthe outside of easing, said pointer being designed to cooperate with the scale such as 62 so as to show the speed for which the alarm is set.

It will be understood that while I have shown and described herein the referred form of my invention, various mo' ifications and rearrangements thereof may be made without departing from the spirit of my invention, and that I contemplate all such modifications as are mechanically and electrically equivalent to the arrangement shown and described herein. It will be further understood that parts of my invention may be used without using the whole.

Having thus described my invention,what I claim is 1. A speedometer apparatus comprising in combination, a movable pointer for indicating the speed of a vehicle, mechanism for operating said pointer, a second pointer adapted to be moved by said first mentioned pointer in one direction, and means normally tending to move said second men tioned pointer in the direction opposite to that in which it is moved by said first mentioned pointer.

2. A speedometer apparatus comprisin in combination, a revoluble spindle, centri ugally operated weights pivoted to said spindle, a pointer for. indicating the speed of a vehicle, mechanism for transmitting the movement of said weights to said pointer, a registering pointer adapted to be moved in one direction by said first mentioned ointer, and mechanism geared to said spindle adapted to move said second mentioned pointer in a direction opposite to which it is moved by said first mentioned pointer, said last mentioned mechanism being'provided. with a sliding connection whereby said second mentioned pointer is permitted to be turned back with the first mentioned pointer. a 3. A speedometer apparatus comprising in combination, a revoluble spindle, centrifugally operated Weights pivoted to said spindle, a pointer for indicating the speed of a vehicle, mechanism for transmitting the movement of said weights to said pointer,- a registering pointer adapted to be moved in one direction by said first mentioned pointer, and mechanism driven from said spindle at a relatively low speed and adapted to move said registering pointer in a direction opposite to which it is moved in the presence of two witnesses.

by said first mentioned pointer.

4. A speedometer a paratus comprisin in combination, a revol ilblespindle, centri ugally operated weights connected to said spindle, a pointer for indicating the speed of a vehicle, a stem on which said pointer is mounted, mechanism for transmitting the movement of saidweights to said stem, a sleeve surrounding said stem, a registering pointer fixed to said stem, means for moving said registering pointer by the motion of said indicating pointer in onedirection, a friction drive for moving said sleeve and said registering pointer in the direction opposite to that in which it is moved by said indicating pointer, and a relatively low speed gear intermediate said spindle and said friction drive.

In testimony whereof I afiix mysignature LESTER O. DUNCAN. Witnesses:

HAROLD SOANTLEBURY, EDNA BROYLES. 

